Improvement in permutation-locks



UNITED STAT-Es PATENT Grricn.

JAMES SARGENT, OF ROCHESTER, NEW YORK.

IMPROVEMENT IN PERMUTATION-LOCKS.'

Specification forming part of Letters Patent No, 9 S,622, dated January 4, 1870.

To all whom t may concern:

Be it known that I, JAMES SARGENT, of the city of Rochester, in the county of Monroe and State of New Yorkhave invented a certain new and useful Improvement in Locks,- and I do hereby declare that the following is a full and exact description of the same, reference being had to the accompanying drawings, in which- Figure l is an elevation of the lock, with the back plate removed, to show the interior; Fig. 2, a vertical cross-sectionwot"the same; Fig. 3, a diagram, showing the cam and the disconcerting-eccentrics in perspective.

Like letters of. reference lindicat-c corresponding parts in all the' gures.

Nature of the Invention. i

This lock is animprovement upon that of' Linus Yale, in which an eccentric roller is combined with the cam for disconcerting the action upon the tumblers.

The invention consists in combining with the cam an arrangement of two or more eccentric rollers, of varying eccentricity, turning upon the same bear-in g, so that in revolving one `or both may turn and alternate in action, thereby greatly increasing the difficulty of mapping out or locating the position of either.

General Description.

In the drawings, A represents the case of the lock; B, `the cylinder for holding the tumblers or wheels; C, the spindle; D, the` cam; E, the dog, which falls to release the bolt; and G, the bolt. These are the ordinary parts employed `in combination-locks, and may be arranged in any desired manner; hence, they need no special descriptionv here.

A single eccentric roller, H, pivoted at a,

.to a suitable arm or bearing, and resting upon the cam D, has been before employed, as already stated. Its object is to disconcert the action inside the-lock, so that an expert lockpick or burglar cannot tell the position of the tumblers when operating upon the lock.

It has been found by experiment, however,

that such a device is not proof against the skill of an expert lock-pick, for by the use of a delicate instrument attached to the spindle outside, an d by careful manipulation, the shape and position ot` this roller can be accurately mapped out or ascertained, and the lockl To obviate thisdiflculty as far as possible I combine, with this roller, one or more rollers, H', pivoted to the same arm or bearing, and

resting upon the periphery of the cam iu the same manner; but all these rollers are made of varyingecceutricity, and of different shape, and, therefore, when the cam is turned, the several rollers strike at ditferent positions, and when one touches, the other may be removed from contact, thus alternating in action. They may also turn in diiferent directions. By this means, owing to the different contact of the several rollers, the difficulty of mapping out and locating the same is very What I claim as my invention, and desire to secure by Letters Patent, is-' The arrangementof two or more rollers, H H', of varying eccentriity, when combined with the cam, in the manner and for the pur pose specified.

In witness whereof I-have hereunto signed my name in the presence of two subscribing JAMES SARGENT.

. witnesses.

Witnesses:

P. F. OscooD, GEO. W. MIATT. 

